Photographing oscillating sparks



c. F. JENKBNS PHOTOGRAPHING OSCILLATING SPARKS Filed Au 50, 1922 Patented Dec. 30, 1 924.

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PHOTOGRAIPHING 'OSGILLATING SPARKS.

Application filed August 80, 1922. Serial No. 585,3 17.

To all whom it may concern:

Be it known that I, CHARLES FRANCIS JENKINS, a citizen of the United States, residing at'Washington, District of Colum- 5 bia, have inventedcertain new and useful Improvements in Photographing Oscillating Sparks, of which the following is a specification.

This invention relates to apparatus for broadcasting of photographs and motionpictures-by-radio, and, has for its object means for imagin a succession of s arks 'on a photographic p ate, the rate of t e oscillation of the sparks varying to correspond to the electrical strength of the current causin the sparks. In't e diagrammatic drawing herewith,a is an oscillating circuit made up of inductively coupled coils b; a condenser c; and a spark gapl d. E is alens for imaging the sparks of t e spark' ap onto the li ht-sensltive film f, drawn fiarward by the drum Assuming the circuit to be adjusted to -the minimum incoming current, the sparks will then occur relatively inf therefore the accumulated actimc effect on the photographic film is inappreciable. But when the current is increased the sparks occur with increasing frequency and therefore the cumulative effect on'the film is increased and a developable-exposnre isobtained. g The photographic plate f is effected directly'as the number of sparks gap d in a iven time. As the 7 ing forwar at a uniform rate it is evident that the more frequent the sparks the ter the density of the area in the dev cad negative will be, and the'less the num' r uently and g the is movof sparks the less the density. Therefore, 40 the densit of the different parts of the negative epends directly on the current fluctuations.

What I claim is- I 1. An oscillating electrical circuit, a spark' gap therein, a light sensitive surface, and means for exposing sparks crossing said gap upon a light sensitive surface whereby fluctuations in the current strength varies the number of sparks passing the gap in so unit time.

2. Anoscillating electrical circuit, a spark gap therein, a photographic surface .to be actinically'afiected thereby, and optical means for focusing said gap upon said photographic surface whereby fluctuations 1n the current strength varies the number of sparks passing the ap in unit time.

3. An oscillating e ectrical circuit, a

' spark gap therein, and, means whereby flucco tuations inthe current strength of said, circuit varies the number of sparks passing the gap in unit time. 4..'An oscillating electrical circuit, a spark-gapl therein, means whereby fluctuatrons in t e current strength of said circuit varies the number. of sparks passing the gap in unit time, and a hotographic surace to be actinically afiected thereb 5. In apparatus of the classdeseri a. 79 light sensitive sm'face, a spark gap so 10- eated that sparkscrossing the p are recorded on the li' ht sensitive sur ace, and means for controlling the number of sparks crossing'the gap in unit time.

In testimony whereof I have a flixed my signature.

' CHARLES FRANCIS JENKINS. 

